11217211157 has 4 divisors (see below), whose sum is σ = 11407333440. Its totient is φ = 11027088876.

The previous prime is 11217211139. The next prime is 11217211219. The reversal of 11217211157 is 75111271211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11217211157 - 2²² = 11213016853 is a prime.

It is a super-2 number, since 2×11217211157² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11217213157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95061053 + ... + 95061170.

It is an arithmetic number, because the mean of its divisors is an integer number (2851833360).

Almost surely, 2^11217211157 is an apocalyptic number.

It is an amenable number.

11217211157 is a deficient number, since it is larger than the sum of its proper divisors (190122283).

11217211157 is an equidigital number, since it uses as much as digits as its factorization.

11217211157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190122282.

The product of its digits is 980, while the sum is 29.

Adding to 11217211157 its reverse (75111271211), we get a palindrome (86328482368).

The spelling of 11217211157 in words is "eleven billion, two hundred seventeen million, two hundred eleven thousand, one hundred fifty-seven".